Pass HPA-1, what do we know?

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#621
Just going through the BOM and I ran into a parts issue with the 2SD2081, which is obsolete. The 2SB1259 is available currently.

Looking to the suggested alternate parts 2SD2014/2SB1257, the 2SD2014 seems to also be out of stock at reputable sellers. Digikey provides an alternate part to the 2SD2014 of KSD1408YTU, which has a complimentary part of KSB1017YTU (still available).

Will the KSD1408YTU/KSB1017YTU be acceptable alternates for the 2SD2081/2SB1259?
 
#624
I could also find 2 originals but I can only sell them together with the board and the parts I have on the HPA
 

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#625
Thank you for the offer! I've already got boards on order, or I'd take you up on it. I'm hoping someone smarter than me can help provide a suggestion on a good substitute since the primary and backup options are now obsolete, and not available through trusted channels. I'm sure others will benefit from learning what a good substitute will be. I'd rather not go the ebay route. Been burned too many times trying that.
 
#626
Hfe on the KSD1408YTU/KSB1017YTU are a bit low. The TIP122/TIP127 which was recommended earlier in the thread have a better Hfe at min 1000 and is also a Darlington like the 2081/1259. The TIP part should work just fine since it sits in the PSU, aka, no music signal going through, and is therefore less critical.. one could say .. as long as it is within reasonable spec.

Pinout is compatible

https://www.diyaudio.com/community/threads/pass-hpa-1-what-do-we-know.300060/page-22#post-7264222
 
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